Brutal 1984 murders of mother and her 15-month-old daughter explored in new true crime series
![Brutal 1984 murders of mother and her 15-month-old daughter explored in new true crime series](https://i.dailymail.co.uk/1s/2021/06/29/11/44810837-0-image-a-54_1624961404891.jpg)
Ron Lafferty, from Utah, claimed he had received a revelation from God to kill his sister-in-law Brenda and her daughter Erica because of her resistance to his belief in polygamy.